CVE-2025-39826

Kernel memory corruption via non-atomic ROSE refcount

Published Sep 16, 2025 · Updated Sep 16, 2025

Use-after-free in the Linux kernel's ROSE networking code allows local users to corrupt kernel memory through an ioctl race. The rose_neigh use field serves as a reference counter without atomic operations, allowing rose_rt_ioctl to remove an object while its timer or another path still references it. Local access to ROSE routing ioctls is required, and successful exploitation can crash the kernel or corrupt protected memory.

CVSS severity8.8
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel's ROSE networking code allows local users to corrupt kernel memory through an ioctl race. The rose_neigh use field serves as a reference counter without atomic operations, allowing rose_rt_ioctl to remove an object while its timer or another path still references it. Local access to ROSE routing ioctls is required, and successful exploitation can crash the kernel or corrupt protected memory.

The record

CVE
CVE-2025-39826
Published
Sep 16, 2025
Updated
Sep 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0085b250fcc79f900c82a69980ec2f3e1871823b
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <203e4f42596ede31498744018716a3db6dbb7f51
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d860d1faa6b2ce3becfdb8b0c2b048ad31800061
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f8c29fc437d03a98fb075c31c5be761cc8326284
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fb07156cc0742ba4e93dfcc84280c011d05b301f
  6. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0085b250fcc79f900c82a69980ec2f3e1871823b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <203e4f42596ede31498744018716a3db6dbb7f51; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d860d1faa6b2ce3becfdb8b0c2b048ad31800061; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f8c29fc437d03a98fb075c31c5be761cc8326284; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fb07156cc0742ba4e93dfcc84280c011d05b301f; version=2.6.12

Published CVSS scores

8.8LinuxCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.0UbuntuCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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